R&M Materials Handling HOIST MONITORS - Manual (Page 45)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
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R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
8.3 CAN-bus topology
Generally it is recommended that a CAN network should be as close as possible to a single line
structure. Thus the bus cable should be one long line into which the stations are connected with short
drop cables. Resistors must terminate both ends of the bus line.
Also other topology options are possible. A star topology with three branches is suitable for a crane with
three separate trolleys and hoists. The end of each branch must be terminated with a resistor.
8.3.1 Termination resistors
The unit includes the termination resistors. So called “split termination concept” with two resistors and
one capacitor is employed. This means that one termination resistor is slip into two resistors of equal
value (100 ohm). The centre tap is grounded via a capacitor (100nF). The termination resistors are
connected through the jumpers X5.
As factory setting the termination resistors are connected. This means that two termination jumpers of the
pin-header X5 located on the CPU board of the unit are connected to the upper position according to the
figure below. If the termination is not desired, the jumpers are set to the lower position. This setting does
not connect anything. The lower pins are only to keep the jumpers available when needed.
1. Default setting: termination resistors connected